Perhaps you should try some spelling variations:
"significantly greatest decrease" » "significantly greater decrease" (Expand Search), "significantly related decrease" (Expand Search), "significantly increases decrease" (Expand Search), "significantly treatment decreased" (Expand Search), "significantly greater increase" (Expand Search)
"significantly reduce decrease" » "significantly reduced decrease" (Expand Search), "significantly greater decrease" (Expand Search), "significantly enhance decrease" (Expand Search), "significantly reduce disease" (Expand Search), "significantly reduce depressive" (Expand Search), "significantly induces decreased" (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("significantly greatest decrease") OR ("significantly reduce decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"significantly greatest decrease\") OR (\"significantly reduce decrease\"))".
• Removing quotes may allow a broader search: (( significantly greatest decrease ) OR ( significantly reduce decrease )).
• Adding a wildcard symbol may retrieve word variants: (("significantly greatest decrease") OR ("significantly reduce decrease"))*.